Mazon Creek Fossil Fauna
Trace Fossils
Coprolites and Trails
Coprolites
Fish coprolite, Milwaukee Public Museum P28708
Three specimens of fish coprolite, A.Young collection - Pit 11, Braidwood, Illinois
Fish coprolite, A.Young collection - Mazon River, Morris, Illinois (containing tiny bivalves)
Fish coprolite, A.Young collection - Mazon River, Morris, Illinois